Boat owners and outboard boat owners know how tedious it can be to keep a boat on a point while fishing or diving. The constant operation of the engine at low speeds not only consumes fuel, but also creates vibrations that prevent comfortable fishing. anchorThis allows the boat to stay at a given point without physically anchoring.
This function is not possible without correct installation. GPS receiverThis is a scaling machine that will transmit coordinates to the onboard computer or cartplotter. Errors in the installation phase can lead to malfunctioning of the system, which is squeezed by the demolition of the boat by wind or current. In this article, we will discuss in detail all the stages of installation, from the selection of the site to the calibration of the system.
Principle of operation and necessary equipment
GPS anchor system, or Anchor LockThis is based on continuous tracking of the boat's coordinates by satellites and automatic adjustment of position using the thruster or the thrust of the main engine. GPS moduleThis ensures high positioning accuracy.
In addition to the signal receiver, the system includes a control controller that processes wind and current data, giving commands to actuators. It is important to understand that a conventional navigation GPS built into the mapplotter often does not have enough refresh rate to effectively hold the point. remote receiver with a high refresh rate, such as 10 Hz and above.
An electric drive is also needed for the system to function, whether it is a nose drive. trim-trim Without a powerful actuator, even the most accurate GPS won't be able to withstand the force of the wind. Below is a table of compatibility between popular systems and different types of equipment.
| System component | Function | Installation requirements |
|---|---|---|
| GPS antenna | Reception of satellite signals | Open skies, no interference |
| Controller | Data processing and logic | Protection against moisture (IP67) |
| Executive mechanism | Course correction | Power corresponds to displacement |
| Display/Remote | Management and configuration | Accessibility for the operator |
Selection of location for installation of GPS antenna
The right location for the antenna is critical to the stability of the entire system, and the signal from the satellites must be flowing smoothly, so there should be no metal structures, masts or awnings above the antenna. high-point superstructure or specially installed mast on the nose.
In the installation of fiberglass cases, magnetic bases are often used, but for permanent operation it is better to drill the hole and fasten the antenna rigidly. cable-input And marine silicone, and the cable should not sag or create loops where water can accumulate.
The antenna should not be placed near high-power sources such as radars, VHF antennas or inverters, and the minimum distance to other antennas should be at least 1 meter to avoid interference.
Place the GPS antenna as far away as possible from magnetic field sources such as compasses and speakers to avoid deviations in course readings.
Cable route laying and switching
The quality of the connection directly affects the reliability of the system. To lay the cables inside the hull of the boat, you need to use corrugated hoses or cable channels that protect the wiring from mechanical damage and moisture. rations or high-quality crimping terminals isolated by thermal shrinkage.
When connecting to the on-board network, be sure to use fuses that correspond to the current consumed by the equipment. The power cable should be installed separately from the NMEA 2000 or NMEA 0183 signal lines to minimize tips.
In places where the cable passes through bulkheads or decks, use sleeves that will prevent the insulation from rubbing against the edges of metal or fiberglass. If the cable passes through an area where water may accumulate, make sure to do so. drop-loop before entering the device.
☑️ Checking the cable track
Connection to the onboard network and cartplotter
Integrating the GPS anchor with the mapplotter requires the right setup of the data exchange protocol. NMEA 2000However, if your hardware is older or uses the NMEA 0183 protocol, you will need to manually configure ports.
Port configuration often requires access to a service menu or device configuration file. For example, activating a high-frequency update mode may require a special command. Make sure that the receiver and transmitter have the same data rate (Baud Rate), which is usually the same as the Baud Rate. 4800 or 38400 Bod.
After you're physically connected, check for power on the device and status indicators to light up. A new device should appear on the mapplotter screen in the list of data sources. If the device is not identified, check for terminators on the NMEA 2000 bus - there should be exactly two, one at each end of the bus.
What if the cartplotter can't see the GPS anchor?
Check the integrity of the cable, make sure that the resistance between the CAN_H and CAN_L lines is 60 Ohms (if you have two terminators), and check the port settings in the device menu, perhaps the port is software-enabled.
Primary system adjustment and calibration
After successful installation and connection, the initial calibration is required, and the system must "understand" the specifications of your vessel, such as sailing, displacement and inertia, which is usually started through a menu. Settings → Anchor Lock → Calibration.
When you calibrate the boat, you have to get it out to the water, where there's no strong current, and the system will ask you to do a series of maneuvers, including turning and moving at different speeds, and this allows the algorithms to calculate. resistance and the efficiency of the thruster.
It is important to calibrate under different loading conditions, if possible, or to choose average values. Poor calibration will lead to the boat constantly "scouring" around the point or wasting excess battery energy to correct the course.
Operation and troubleshooting
During operation, there may be situations when the system loses a point or is unstable, often due to deterioration of satellite geometry (low HDOP), in which case the system may temporarily go into standby mode or request confirmation from the operator.
Check the status of antenna mounts and cable integrity regularly, especially after winter storage or long wave transitions. Vibration can weaken contacts. Also, monitor battery power, as the operation of the GPS anchor in windy weather can significantly increase energy consumption.
If you notice that the boat is being demolished despite the system's active operation, you should immediately switch to manual control. No automation can replace the captain's experience in extreme conditions. Always have a backup plan in case of electronic failure.
Regular check of connections and updating of the firmware of the cartplotter is the key to stable operation of the GPS anchor system in any conditions.
⚠️ Attention: Never rely entirely on a GPS anchor system in a severe storm or near navigational hazards, and always monitor the situation visually and with navigational instruments.
⚠️ Attention: When welding on the boat hull, be sure to turn off all electronic devices, including GPS antennas, to avoid breaking through high-frequency currents.
Frequently Asked Questions (FAQ)
Can you use a GPS anchor system in high winds?
The efficiency of the system depends on the power of your thruster or motor. If the wind is greater than the thrust of the engine, the system will not be able to keep the boat at a point. The equipment instructions usually specify the limits of wind speed and current.
Does the GPS anchor land the battery?
Yes, the system requires constant engine rotation or electric motor operation, which consumes energy. When you are at anchor for a long time, it is recommended to have an additional battery or engine running to recharge.
Do I need to recalibrate the system every season?
Recalibration is required if you have changed the configuration of the boat (install a new tent, heavy equipment) or replaced the actuators.
Does the system work at sea without cellular coverage?
Yes, the GPS anchor does not require cellular communication, and the system uses GPS/GLONASS satellite signals that are available anywhere in the world where there is a direct view of the sky.